1872222809 has 2 divisors, whose sum is σ = 1872222810. Its totient is φ = 1872222808.

The previous prime is 1872222757. The next prime is 1872222851. The reversal of 1872222809 is 9082222781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1022208784 + 850014025 = 31972^2 + 29155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1872222809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1872221809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936111404 + 936111405.

It is an arithmetic number, because the mean of its divisors is an integer number (936111405).

Almost surely, 2^1872222809 is an apocalyptic number.

It is an amenable number.

1872222809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872222809 is an equidigital number, since it uses as much as digits as its factorization.

1872222809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 1872222809 is about 43269.1900663740. The cubic root of 1872222809 is about 1232.4969237128.

The spelling of 1872222809 in words is "one billion, eight hundred seventy-two million, two hundred twenty-two thousand, eight hundred nine".